234 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [BuU. 



Female. — Similar to the male. 



Vulvar lamina not projecting ventrad conspicuously, the plates 

 broadly rounded, w^ith a shallow median notch. 



Measurements : total length, male 54-63, female 57-68 mm. ; 

 length of abdomen, male 36-41, female 39 mm. ; length of hind 

 wings, male 33-38, female 35-41 mm. 



Genus Neurccordulia Selys 



Nymphs of this genus have not been reared. Needham has 

 described what he supposes to be the nymph of the only represen- 

 tative. He says it is similar to Hagenius and Epicordulia, but 

 differs from all nymphs known to him in having curved ridges on 

 the femora of the first two pairs of legs, a transverse occipital 

 ridge and very short basal segments. An exuviae received from 

 Dr. Calvert and compared with specimens from other sources 

 shows that the diverging spines on segment 8 and the very deep 

 teeth of the labial palpi are important characters. 



Adults, — Sectors of arculus not united at base, triangle with 

 cross-veins; area between Cu^ and M^ widened at the margin of 

 the front wing; dark spots sometimes on wing at base and along 

 costal margin ; abdomen of female without a long forked process 

 on venter of 8 ; color not metallic. 



Not much is known of the habits of members of the genus. 

 The only representative collected in Connecticut was found near 

 a fairly large stream in the northern part of the State. It was 

 collected between 3:00 and 6:00 p. m. and was found resting in 

 some weeds in a woodland pasture. 



Key to Species 



Adults 



I. Antenodals in front wings 7 to 8, those behind Sc infuscated as 



far as the nodus ; a nodal spot also present obsoleta 



Antenodals in front wings 9 to 11, those behind Sc not infuscated 

 as far as the nodus and without a nodal spot yamaskanensis 



Neurccordulia obsoleta Say 



Journal of the Academy of Natural Sciences of Philadelphia, 8: 29: 1839. 



Nymph (PI. iv. Fig. 6). — Color dark brown. 



Head: mentum about as broad as long, extending between the 

 procoxae and with 9 mental setae on each side ; palpi with 6 lateral 

 setae, and 6 mesal teeth, which are longer than broad and have 

 several spines at their apices ; mesal margin of palpi also setose ; 

 the first tooth below the movable spine or distal segment of the 

 palpi is bifid. Antennae /-segmented, the third and sixth subequal 

 and longer than the rest ; ventral margin of labrum setose ; loca- 

 tion of the ocelli marked by pale spots; vertex and occiput 



